<!DOCTYPE html>
<html>
<head>
    <title>ElementInternals.setFormValue(nullish value) should clear submission value</title>
    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-elementinternals-setformvalue">
    <script src="../../resources/testharness.js"></script>
    <script src="../../resources/testharnessreport.js"></script>
    <script>
        customElements.define("test-form-element", class extends HTMLElement {
            static formAssociated = true;
            constructor() {
                super();
                this.i = this.attachInternals();
            }
        });
    </script>
</head>
<body>
    <form id="form-null">
        <test-form-element id="input-null" name="input-null"></test-form-element>
    </form>

    <form id="form-undefined">
        <test-form-element id="input-undefined" name="input-undefined"></test-form-element>
    </form>

    <script>
      test(() => {
        const input = document.getElementById("input-null");
        input.i.setFormValue("fail");
        input.i.setFormValue(null);
        const formData = new FormData(document.getElementById("form-null"));
        assert_false(formData.has("input-null"));
      }, "ElementInternals.setFormValue(null) clears submission value");

      test(() => {
        const input = document.getElementById("input-undefined");
        input.i.setFormValue("fail");
        input.i.setFormValue(undefined);
        const formData = new FormData(document.getElementById("form-undefined"));
        assert_false(formData.has("input-undefined"));
      }, "ElementInternals.setFormValue(undefined) clears submission value");
    </script>
</body>
</html>
